Liquid-fuel-supply device for internal-combustion or like engines



Sept. 1 6. 1924.

o. .falsal--lal-av LIQUID FUEL SUPPLY DEVICE FOR INTERNAL COMBUSTION OR LIKE ENGINES Filed May 2, 1924 Patented Sept. 16, 1924.

PTENT 'Fmi y erro sinranr, yor BERLIN, osa-MANY.

Application fIed May 2,

.To all whom t may concern Be it known that l, OTTO SIEFERT, a citi Zen of the Republic of Germany, residing in Berlin, Germany, have invented certain new and useful Improvements in Liquid-Fuel? Supply Devices for Internal-Combustion lor like Engines, of which the following is a specification. y,

This invention comprises improvements in or relating to liquid fuelsupply devices for internal combustion or like engines and more particularly to double acting liquid fuel supply devices in which the fuel is drawn by suction from a main tank and from which it passes on its way to the Carburettor through a supplementary tank provided with means for controlling the connections between said main tank and Carburettor and for connecting the supply device alternately to the suction source and to the atmosphere. Known fuel supply devices of this type are provided with two adjacently arranged suction'chambers, with a float in each chamber, each of said floats controlling a suctionand an air valve respectively. Theopenings for the fuel inlet and discharge are controlled by automatic valves. As long as the chambers are subjected to suction, fuel is sucked in; and as long as they are connected to the atmosphere, fuel is delivered to the supply pipe of the carburettor. y The device according to this invention differs from such known double-acting fuel supply devices, in that two suction chambers are adapted to be connected alternately? to a source of suction and to the atmosphere and in that the air and suction valves in both chambers are both controlled by one float only, so that the working gear is simplified whereby the working of the device is made more reliable. ,i y

For example, a simple construction ofthe fuel supply device may be formed lby the suction chambers being arranged concentrically or one within the other, and such a suction device is illustrated, by way of eX- ample, in the accompanying drawings, in which- Fig. 1 isvertical section through the device, showing the float in its lowest position, and in which the immer chamber is connected to the suction source and is filled, whilst the outer chamber is subjected to atmospheric pressure and is discharging.

Fig. 2 shows the upper part of the device shown in Fig. 1, with the float at its highest 1924. Serial N10. 710,680.

position. Inthis position of the parts'the outer chamber will be filling during the ldischarge of the contents of the inner chamer. v Fig.k 3 is asection through the fuelinlet in a differentr vertical planek to that shown in `Figures land 2. o ,l

The outer chamber l and the inner chamber 2 are, connected at their top edges byy a ring 8, serving at the same time as a flange for securing the 'cover 4. The connection between the ringl and cover is made airtight by means ofa gasket 5. The cover is pro-` vided with connecting nipple 6 for the suctionpipe, and a connecting nipple 7 lfor the fuel supply pipe, and contains the valves y for kconnecting the ,chambers alternatelyy to the suction pipe andvto the atmosphere.y The suction valve'8 for the outer chamber and the suction valve 9 forv the inner chamber form a connected double-seated valvehavy y 2) the valve chamber'10`is connectedby On the double valve 8, 9 being lifted (Fig. l

means of the channel 12 to the outer chamber 1, byy the upper valve `8 being raised ber 2rk by the lower valve 9. On the double valve being lowered (Fig. 1) the outer chamber 1 is cut olf from the valve chamber lO, while the inner chamber2 is connectedthereto by means of the passages 13 in the tubular part which acts as a valve guide.

The connection of the two chambers 1 and 2' with r,the atmosphere or their isolation therefrom is controlled by a similar air valve 141 The latter is formed as a hollow piston valve provided laterally with inclined passages 15., which eect, when the valve is lifted, (Fig. 2), a connection betweenV the inner suction chamber 2 andthe valve chamber 16 in which the piston valve works, this chamber beingconnected to the atmosphere by the passage 17, and to the outer chamber by a second passage 18. The passage 18 is closed to the atmosphere wheny the air valve 14 is lifted (Fig. 2) (while air is admitted to the chamber 2)k and'opened when the valvef14` is closed (Fig. `1) (while airis cut off from'theinner chamber 2). Thus the valve 14 serves'simultaneously as a control valve for the two chambers.

The double seated valves 8 and 9 as well as the sli/de valve 14 are"connected by a plate from lits rest but is closed to the inner cham- ,8 5

or bridge 19, mounted on a vertical tube 20 which is guided on a pin 2.1 lsecured. in the cover 4. A float 22 is guided on the tubex takes place through a passage 27 and tol the outer chamber 1 through a passage 28 in the cover 4 (Fig. 3). The endsy of these passages are closed by flapl valves 29 and 30 which are automatically opened by the flow of the fuel.

. The discharge of the fuel from the inner vchamber 2 takes place through a tube 31 which passes Athrough thev bottom of the outer chamber 1, and is provided with an automatic check valve 32.

v A similar valve 3'3is provided in the bottim of'y the outer chamber 1. Both. valves are housed in a casing 34 provided with a socket f for the tube leading to the carburettor.

The operation of the fuel supply de-vice according to this invention isI as follows Assuming the inner chamber 2 is empty and the outer -chamber 1 is full, the float will be at its lowest position (Fig. 1). The suction valve 9y is open and the inner chamber 2 is thus connected to the suction passage 11. The air valve 14 is closed. The

l Vsuction valve 8 of the outer chamber 1 is closed and the air passage 18 to t-he outer chamber 1 is open. Consequently fuel will flow th-rougfrh the fuel passage 27 and valve v29 intor the inner chamber 2, while the outer chamber 1 can discharge through the valve As the inner chamber 2 fills the oat 22 Arises and finally abuts against and lifts the bridge 19, together with the valves thereon, thereby reversing the operation of chamber 1 becomes connected thereto.

the suction chambers 1 and 2. The valve 9' closes and the valve 8 opens (Fig. 2)v whereby the inner chamber 2 becomes isolated from the suction passage and the outgrn the other hand the inner chamber 2 becomes connected through the valve 14 to the atmosphere, and the outer chamber 1 isolated therefrom., by the slide valve 14 closingk the channel 18. y

As a consequence the discharge valve 32 of the inner chamber 2v opens and allows the contents in Ithis chamber to flow into the casing 34, andl through the fuel conduit to the Carburettor, while the outer chamber 1 fills with fuel which flows in through the passage 28l and valve 30.

A pressure compensation between the two chambers 1 and 2 through the passages 27 .and 28, is not possible, since the check valve the outer chamber 1 remains closed by the l suction therein. On gradually discharging the inner chamber 2 the float 2O sinks and on striking against the flange 23 on the tube 20 the position of the suction and air valves are reversed (Fig. 1).

The outer chamber 1 is now in turn subjected to atmospheric pressure and the inner chamber 2 to suction. The valve 33 opens while the valve 32 closes,'the outer chamber 1 discharges into the casing 34 and into the conduit to the Carburettor, while the imier chamber 2 againfills. In this manner the cycle of operations is continuous.

Overflowing of the outer chamber 1 is prevented by the float 24, which would close the channel 12 by means of the valve 26 and thus. prevent fuel from being drawninto the Y Y passage 12.

What I claim is:

1. A liquid fuel supply device comprising an inner chamber; an outer chamber; a ring forming a cover for said .outer chamber; a cover for 'said inner chamber secured to said ring; a double suction valve in said cover adapted to control the suction for both chambers; an air inlet valve in said cover adapted to control the supply of air into di the chambers; a bridge member secured to said valves; a float in said inner chamber adapted to actuate the valves by means of said bridge; a fuel inlet for each chamber; and a fuel outlet foreach chamber.

2. A liquid fuel supply device for internal combustion engines comprising twov suction chambers arranged one within the other, an

-automatic fuel-inlet valve and 'an automatic fuel-outlet valve in each chamber, an airinlet passage and a suction passage communicating with each chamber, valves in llO ternately to atmosphere and suction, substantially as set forth. Y

3; A liquid fuel supply device comprising an inner chamber; an outer chamber a cover for said chambers; a suction valve in said'cov'er adapted to control the suction for said chambers; an air'inlet valve in said cover adapted to control the supply ofL air into said chambers; a bridge member secured' to said valves; and a float in'one of said chambersadapted to actuate the valves by means of said bridge.A

l. A. liquid fuel supply device comprising an inner chamber; an outer chamber surrounding said inner chamber; e cover for said chambers; al float in said inner chamber; a suction valve in seid cover for controlling the suction in seid chambers; an air inlet valve in said cover for controlling' the inlet of air in seid chambers; a fuel inlet in seidv cover for euch Chamber; e fuel outlet for each chamber; and means operated by said float for operating both vulves simultaneously to intermittently lill and empty said chambers of fuel.

5. A liquid fuel supply device comprising an inner chamber having e tube secured thereto; an outer Chamber surrounding Said inner chamber and having an outlet; e cover for said chambers; a float in one of seid chambers; a. pair of valves in said cover for controlling the inlet of air and suction in said chambers and operated by said Hoet;

and a' fuel outlet casing secured to the bottom of said outer easing and*k in Communication With seid tube and outlet, said tube eX- tending` through said outer chamber;

6. A liquid fuel Supply device comprising an inner ehembe; an outer chamber surrounding seid inner Chamber; e cover for seid chambers; e fuel inlet for each cham# ber; e pair of yvalves in said ycover for controlling the. inlet of air and the suction in said ehambers; a float in one of seid chainbers; and ineens secured to Seidy valves and operated by said float for Simultaneously 0perating said valves to yintermittently lill and empty each `chamber of fuel.

In testimony whereof I eflix my signature in presence of two Witnesses.

` OTTO SIEFERT. lVitnesses VVLAD. ENDERS, ROGER SAINPACE. 

